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The skull forms the anterior most portion of the skeleton and is a product of cephalisation—housing the brain, and several sensory structures such as the eyes, ears, nose, and mouth.In humans these sensory structures are part of the facial skeleton.Functions of the skull include protection of the brain, fixing the distance between the eyes to allow stereoscopic vision, and fixing the position of the ears to enable sound localisation of the direction and distance of sounds.In some animals such as horned ungulates, the skull also has a defensive function by providing the mount (on the frontal bone) for the horns.
At birth these regions are fibrous and moveable, necessary for birth and later growth.
This growth can put a large amount of tension on the "obstetrical hinge", which is where the squamous and lateral parts of the occipital bone meet.
A possible complication of this tension is rupture of the great cerebral vein.
Some of these bones—the occipital, parietal, frontal, in the neurocranium, and the nasal, lacrimal, and vomer, in the facial skeleton are flat bones.
The skull also contains sinus cavities and numerous foramina. Their known functions are the lessening of the weight of the skull, the aiding of resonance to the voice and the warming and moistening of the air drawn through the nasal cavity. The largest of these is the foramen magnum that allows the passage of the spinal cord as well as nerves and blood vessels.